docs: def group_list(self, params=None):
          ''' /v1/firewall/group_list
          GET - account
          List all firewall groups on the current account.
  
          Link: https://www.vultr.com/api/#firewall_group_list
          '''
          params = params if params else dict()
          return self.request('/v1/firewall/group_list', params, 'GET')